Coil-support.



L; RAPP. COIL SUPPORT.

APPLICATION FILED OUT. 23, 1912.

Patented Dec. 8, 1914.

WITNESSES:

ATTORNEY HE NORRIS PETERS c0 PHOTO LJIHO, WASHING rcml. D c

UNlTED STATES L ATENE @FFlCE.

LEO RAPE, OF FITTSIBUEGH, l ENNSY VAl IA, ASSIG-NGR Ti) WESTINGE-I USE ELECTRIC AND IvEANUEAC'lURIIlG COMPANY, A G SRPGRATEGN (5F PENNSYLVANEA.

GGIL-EUPPGRT.

Specification of Letters fcatent.

Patented Dec. 8, 191 2.

Application filed Ectober 23, 1912. Serial No. 72?.290.

T 0 all whom it may concern:

Be it known that I, LEO Barr, a citizen of the United States, and a resident of Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in "Coil-Supports, of which the following is a specification.

My invention relates to dynamo-electric machines, and it has special reference to field coil supporting structures for machines having polar projections which are provided with series or commutating field coils concentrically disposed around main shunt field coils.

One of the objects of my invention is to provide a simple and effective device of the above-indicated character which may be cheaply and readily made from sheet metal, or the like, and which shall be light and durable in construction.

Another object of my invention is to provide a supporting structure for concentrically disposed field coils which shall en body resilient means for independently maintaining each of the coils firmly in position, so that chattering vibration, such as is commonly encountered, is prevented.

Another object of my invention is to provide a supporting structure that may be assembled with facility and that shall, by reason of its peculiar construction, be adapt ed to support field coils which not only may have slight variations in width due to nonuniformity in the manufacture, but will also acco amodate coils of various sizes, so that a single size of supporting bracket may be utilized for a number of different sizes of machines.

A still further object of my invention is to provide means for maintaining the shunt coil against the pole tips of the polar projection and also for supporting the series coil in concentric relation therewith, in such manner as to permit liberal heat radiation and ventilation.

In Patent No. 1,086,096, granted to Charles W. tarker on Feb. 3, 191%, on a co-pending application and assigned to the lt estinghouse Electric a Mfg. Company, a dynamo-electric machine is disclosed having coil-supporting brackets of the same general class as that to be hereinafter described, but the coil-supporting structure set forth in the application referred to, is not provided with means for resiliently maintaining the series coil in position, and, furthermore, it is not adapted, by reason of any yielding means or otherwise, to accommodate itself to variations in the widths of the series coils.-

llhen supporting brackets of the above mentioned type are employed commercially for all machines of a particular design or class, a large number of sizes of brackets F26 necessary for different sizes of machines, which involves unnecess y expense, and, moreover, such coil supports make it necessary that he series coils be of exact dimensions.

According to my present invention, 1 pro pose to orovide a coil-supporting structure that shall be so constructed as to overcome the objections hereinbefore recited and that may be employed either in connection with compound wound dynamo-electric machines or shunt wound machines having commutating coils disposed upon the polar projections in concentric relation with the main shunt field coils.

i invention is illustrated in the accompanying drawing in which Figure l is a view, partiall in side elevation and partially in section, of a portion f a dynamoelectric machine embodying my invention. Fig. is a face view, taken in tion of the arrow shown in 1. a portion of the polar projection and its so l field coils, said parts being deiched from the field nagnet frame for the sake of clearness. Fig. 3 is a sectional vie "alien along the line llllll of Fig. l, showi -g the relative arrangement of the field coils and the supporting structure therefor. Fig. l is a perspective view of a neld C0ll support, such as is shown in Fig. l, and is also a perspective view of a modified form of supporting structure embodying my invention.

Referring to the drawing, the device here shown comprises a field magnet frame or yoke 1 having a plurality of polar projections 2, each of which is provided with a shunt field coil 3 and a series or commutating field coil 4:, said coils being concentrically disposed and maintained and supported in position by means of a plurality of coil-supporting members or brackets T he field magnet framel and the polar proj ections Qmaybe of anywelllrnown construction, and the polar projections 2 are preferably detachably mounted upon the field magnet frame 1 by suitable bolts 6. The shunt coil 3 compri es a plurality of convolutions of insulated conductor which are bound together to form a single unit, in accordance with well known practice. The shunt coil 3 is long and relatively thin and fits comparatively tightly around the polar projection 2, the inner end thereof resting against pole tips 8 of said polar projection. The series or commutatingcoil 4 may also be of any construction that is common in the art, said coil being short, as compared with the shunt coil 3, and of such dimensions that it is adapted to surround the shunt coil 3 and be liberally spaced therefrom in order to insure good ventilation and radiation. The series coil 1 is conveniently located substantially midway between the ends of the shunt coil 3, although I do not wish to be restricted to this particular arrangement, as it may be desirable to locate the same either near the inner end of the shunt coil 3 or near the op posit-e end adjacent to the field magnet frame 1.

1n orderto support the outer coil 1 in position and also to maintain the shunt coil 3 firmly against the pole tips 8 so that chattering and vibration thereof'shall be prevented, a plurality of supporting brackets are employed, which are severally disposed on coils 3, in a manner to be hereinafter set forth. The supporting bracket 5 comprises a plurality of arms 9 and 10, and a yoke or connecting member 11. The free ends of the arms 9 and 10 are provided with outwardly disposed projecting flanges 12 for coiiperative engagement with the outer or series coil 4, while the yoke member 11 is provided with a plurality of inwardly projecting fingers 13 which are spaced apart in such mannor as to provide a plurality of slots or openings 14- for the reception of a spring or resilient member 15. The inwardly projecting fingers 13 are adapted to cooperate with the outer end of the shunt coil 3, and the arms 9 and 10 and yoke 11 are adaptedtorest flatly against the side of the shunt coil 3.

The spring 15 is preferably of ii-shape and may conveniently be constructed of leaf or strap material which is fashioned into substantially the form indicated, the mid portion thereof being disposed between the middle finger 13 and the outer end of the shunt coil 3, while the opposite end portions project through the several openings 1 1 and rest against the inside of the field magnet frame 1. By reason of the resiliency of the spring member 15, the shunt coil 3 is held away from the frame 1 and is pressed firmly against the pole tips 8. The yoke portion 11 is also provided with a plurality of outwardly projecting fingers 16 that are adapted to support a V-shaped spring 17 of subthe opposite sides of each of the shunt stantially the same type as that already described. 1-1 wearing plate 18 is provided with a tongue portion or apron 19 that is disposed substantially at right angles thereto, and said apron 19 is located intermediate the supporting arms 9 and 10 and between the shunt coil 3 and the outer series coil 4. The wearing plate 18 rests against the outer end of the coil 1 and is engaged by the ends of the spring 17, thereby relieving the coil 1 from unnecessary wear due to the pressure exerted by the ends of the spring 17.

Preferably, the supporting brackets 5 are formed of sheet metal punchings, but other forms of supporting devices may be employed without departing from the spirit and scope of my invention.

t is evident, from the construction already set forth, that it is unnecessary to make the field coils of exact dimensions, inasmuch as the resiliency of the members 15 and 1? permits of considerable variation in size. Moreover. it will be found in commercial practice that coil support 5 of a single size may be employed to support coils of widely difierent design and dimensions by reason of the element of yielding that is afforded by the springs 15 and 17.

Reference may now be had to Fig. 5 which illustrates a field coil support of a somewhat similar construction to thatjust described, except that, in place of the pinrality of lingers 16, a single flange 16 is provided which is adapted to cooperate with the spring 17 that is disposed between said flange 16 and the wearing member 18. The wearing member 18 is provided with a projecting edge or rim in order to prevent the spring 17 from being displaced. Obviously, under certain conditions, it may be found desirable to omit the wearing plate 18 and to permit the opposite ends of the spring 17 to bear directly upon the outer coil 1. These and other modifications in the structural details and arrangement and location of parts may be effected without involving the exercise of the invention, and I desire that only such limitations shall be imposed as are indicated in the appended claims.

1 claim as my invention:

1. 111 a dynamo-electric machine, the combination with a field magnet frame having a plurality of polar projections, and a plurality of field coils concentrically disposed thereon, of unitary structures disposed on the opposite sides of said coils for independently and resiliently maintaining and supporting said coils in position.

2. In a dynamo-electric machine, the combination with a field'magnet frame having a plurality of polar projections, and a plurality of field coils concentrically disposed thereon, of means comprising'resilient devices for maintaining one of said coils in position, and resilient devices associated with said means for supporting the other coil in position.

3. in a dynamo-electric machine, the combination with a field magnet frame having aplurality of polar projections, and a plurality of field coils concentrically disposed thereon, of a plurality of supporting brackassociated with one of said coils and disposed on the opposite sides thereof, resilient means disposed between said brackets and said magnet frame for exerting a separating pressure between said coil and said frame, and resilient means associated with said brackets for cooperating with the other field coil and securing it in position.

at. In a dynamo-electric machine, the combination with a field magnet frame having a. plurality of polar projections, and a plurality of field coils concentrically disposed thereon, of a plurality of supporting grids or brackets severally disposed on the opposite sides of one of said coils, a spring mechanically associated with a portion of each supporting grid or bracket and adapted to press against the field magnet frame, means associated with said grids or brackets for engaging the other field coil, and other means associated therewith and embodying a spring for forcing said second field coil against said coil-engaging means.

5. In a dynamo-electric machine, the combination with a field magnet frame having a plurality of polar projections, and a plu rality of field coils concentrically disposed thereon, of grids adapted to engage the ends of one of said coils, springs interlocked with said grids and serving to exert a separating pressure between the same and said frame, coil-engaging flanges associated with said grids, an independent wearing member adapted to rest against the outer coil, and a spring interlocked with said grid and engaging said wearing member for forcing said second coil against the coil-engaging flanges.

In testimony whereof, subscribed my name this 1912.

I have hereunto 12th day of Oct,

LEO RAPP.

B. B. HINES.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents.

Washington, I). C. 

